Harry had a lot of trouble keeping his mind on his lessons that day.

那天，哈利很难定下心来认真听课。

Harry screwed up his eyes too; he wanted to keep his mind on the game.

哈利把眼睛也闭上了，他想让自己的注意力集中在比赛上。

This time he could not keep his mind on the words before him.

这一次他无法将注意力放在眼前的话上。

He could hardly keep his mind on what she was saying.

【mind】他无法集中心思听她说话。

By now, the carbon dioxide in his blood causes an almost irresistible urge to gasp for air, but Sulbin must keep his mind on the hunt.

现在他血液中的二氧化碳唤起了一股几乎无法抗拒的对呼吸的渴望，但瑟宾必须把精力集中在捕猎上。